Fix up base::DoNothing to cleaner format.

Change-Id: I055135607864517abb3a46c8976ccf025344444c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992959
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730002}

chrome/browser/ui/web_applications/web_app_dialog_utils.cc

@@ -93,11 +93,12 @@ void CreateWebAppFromCurrentWebContents(Browser* browser,
   WebappInstallSource install_source =
       InstallableMetrics::GetInstallSource(web_contents, InstallTrigger::MENU);
 
+  WebAppInstalledCallback callback = base::DoNothing();
+
   provider->install_manager().InstallWebAppFromManifestWithFallback(
       web_contents, force_shortcut_app, install_source,
       base::BindOnce(WebAppInstallDialogCallback, install_source),
-      base::BindOnce(OnWebAppInstalled,
-                     base::DoNothing::Once<const AppId&, InstallResultCode>()));
+      base::BindOnce(OnWebAppInstalled, std::move(callback)));
 }
 
 bool CreateWebAppFromManifest(content::WebContents* web_contents,